DMB transmitting system capable of simultaneously transmitting III waveband and L waveband

A transmission system, L-band technology, applied in the field of DMB transmission system, can solve the problems of difficulty in implementation and high cost, and achieve the effects of low cost, low power consumption, and easy implementation

Active Publication Date: 2019-03-29
CHONGQING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the DMB system using the III-band signal, adding a DMB transmission system that transmits the L-band signal is obviously too expensive and difficult to implement

Method used

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  • DMB transmitting system capable of simultaneously transmitting III waveband and L waveband
  • DMB transmitting system capable of simultaneously transmitting III waveband and L waveband
  • DMB transmitting system capable of simultaneously transmitting III waveband and L waveband

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Embodiment Construction

[0030] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0031] Such as figure 1 As shown, a kind of DMB transmission system of the present invention that can simultaneously transmit III band and L band includes: COFDM encoder, up-converter, power divider, III band filter, L band frequency conversion module, power amplifier and transmitting Antenna; where the up-converter, III-band filter, power divider and L-band frequency conversion module are integrated on one board. The COFDM encoder includes a convolutional encoding module, a time interleaving module, a frequency interleaving module, a DQPSK modulation module and an OFDM modulation module connected in sequence, and realizes the data to be sent through a field programmable gate array (Field-Programmable Gate Array, FPGA). coding. Such as figure 2 As shown, the L-band frequency conversion module includes a low-noise amplifier, a phase-lock...

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Abstract

The invention relates to a DMB transmitting system capable of simultaneously transmitting an III waveband and an L waveband, and belongs to the field of wireless communication. The system comprises aCOFDM encoder, an up-converter, a power divider, an III waveband filter, an L waveband frequency conversion module, a power amplifier and a transmitting antenna; the L waveband frequency conversion module comprises a low-noise amplifier, a phase-locked loop frequency source part, a direct up-conversion module and an L waveband pass filter; and the phase-locked loop frequency source part comprisesa constant-temperature crystal oscillator and a PLL. In the L waveband frequency conversion module, an III waveband signal is amplified by the low-noise amplifier and then is connected into the directup-conversion part, meanwhile, a local oscillator signal is connected into the direct up-conversion part, and the III waveband signal and the local oscillator signal are subjected to frequency mixingon the direct up-conversion part; and a frequency mixing signal is connected into the L waveband pass filter for carrying out filtering. The problem of signal coverage in practical application is solved; the user experience of a DMB product is improved; the cost is reduced; and the structure is simplified.

Description

technical field [0001] The invention belongs to the field of wireless communication, and relates to a DMB transmitting system capable of simultaneously transmitting III bands and L bands. Background technique [0002] Digital Multimedia Broadcasting (Digital Multimedia Broadcasting, DMB) is developed on the basis of digital audio broadcasting. It is a wireless high-speed information transmission technology, which makes full use of Digital Audio Broadcasting (Digital Audio Broadcasting, DAB). Functionally, the transmission of single audio information is extended to multiple carriers such as data, text, graphics and video. [0003] In the practical application of digital multimedia broadcasting, it consists of a transmitting system and wireless receivers of various multimedia terminals. [0004] The existing DMB transmission system can only transmit a single band (III band or L band). In practical applications, the DMB system generally uses the III band (174MHz-250MHz). Howe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/00H04B1/04
CPCH04B1/005H04B1/04H04B2001/0491
Inventor 王国裕杜鹏张红升张炎
Owner CHONGQING UNIV OF POSTS & TELECOMM
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